In this ongoing study, we are determining: 1) the reliability and validity of Automated Telephone Disease Management (ATDM) assessments of patients' glycemic control, health-related quality of life (HRQL), self-care, and satisfaction with care; 2) the extent to which these assessments identify patients at risk for poor outcomes; and 3) the cost-effectiveness of an intervention in which ATDM assessment reports are provided regularly to patients' primary care providers.